Add 'postman_send_transaction_example.yml' workflow file

.github/workflows/postman_send_transaction_example.yml

@@ -0,0 +1,40 @@
+name: Postman Send Transaction Example
+
+on:
+  schedule:
+  - cron: '0 1 * * *'
+  push:
+    branches:
+    - feat/postman-examples
+  workflow_dispatch:
+
+jobs:
+  deployed-env-checks:
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Checkout Rosetta
+      uses: actions/checkout@v2
+
+    - name: Setup Node
+      uses: actions/setup-node@v2
+
+    - name: Install newman
+      run: npm i newman
+
+    - name: Set private key
+      env:
+        PRIVATE_KEY: ${{ secrets.POSTMAN_SEND_TRANSACTION_EXAMPLE_PRIVATE_KEY }}
+      working-directory: ./examples/postman
+      run: jq "(.values[] | select(.key==\"privateKey\") | .value) |= \"$PRIVATE_KEY\"" send_transaction_postman_environment.json > ./temp_env.json && mv ./temp_env.json ./send_transaction_postman_environment.json
+
+    - name: DEBUG
+      working-directory: ./examples/postman
+      run: cat send_transaction_postman_environment.json
+
+    - name: Run Signing Server
+      working-directory: ./examples/postman
+      run: npm i && node sign-transaction-server &
+
+    - name: Run Send Transaction Example
+      working-directory: ./examples/postman
+      run: node send-transaction-example send_transaction_postman_environment.json

examples/postman/send-transaction-example

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+const newman = require('newman');
+
+const env = process.argv[2]
+
+newman.run({
+    collection: require('./send_transaction_ci.postman_collection.json'),
+    environment: require(`./${env}`),
+    reporters: ['cli', 'json']
+}, function (err, summary) {
+	if (err) { 
+        console.error('collection run encountered an error.');
+    } else if (summary.run.failures.length) {
+        console.error('assertion failure occured.');
+        process.exit(1);
+    }
+    console.log('collection run complete!');
+});